Joining abrasive sheets.



E. J. BBIN.

JOINING ABRASIVE SHEETS. APPLICATION FILED JUNE 2, 1907. RENEWED us. 12, 1912.

1,037,582, Patented Sept. 3,1912.

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EMILE .1. BEIN, or nnwanm unw .rnasmr.

JOINING anms'rvr. snaa'rs:

037,582. Original application filed April Specification of Letters Patent .1907,- Serial .No. 876,962. Renewed February 12, 1912. Serial No. 677,186..

To all whom it may concern: I

Be it known that I, EMaLE J. Brain, of Newark, New Jersey, have-invented certain Improvements in Jomin Abrasive Sheets, of which the following escription, in connection with the accompanying. drawings, is a: s ecification, like letters-on the drawings desi nating like parts.

This invention relates to devices for grinding, and more particularly to joints in endless belts surfaced with grains of abrasive material and adapted for use in connection with the type'of machineeillustrated in Letters Patent #561,557, granted to me on the 9th day of June 1896, and also #833,726 granted to ine on the 23rd day of October, 1906, although I do not limit myself to the fi-iny improvements for joining endless belts, .but' contemplate their utilization in any field for which they are adapted by their nature.

I have devised a joint for the ends of abrasive belts of the above character, or similar abrasive devices,'such that the abrasive character of the surface is of continudiate region, thus obviating a "serious drawback to the use of such belts, caused hitherto by the presence upon their surface of glue or other' adhesive used in making the joint, which has a tendency to work up from the fabric foundation of the belt and submerge the grainsof abrasive material in the region of the joint, makingra smooth, nonabrasive spot. This destroys the abrasive character of the belt at the joining, and im pairs considerably the efliciency of the belt as a whole.

The essential feature of my invention resides in restraining the glue or adhesive from thus submerging the grains, and this I accomplish by the imposition of an artificial graining at the region of the joint, preferably by ineans of a graining member, such as a wire mesh screen pressed against the grain bearing surface of the belt at the region of the joint, at the time of making the same, the wires acting to restrain and.

' compress the adhesive, while permitting the protrusion of the abrasive particles into the meshes, so that in the finished article the particles project as cleanly and sharply at and in the region of the 'olnt as they do at any other portion of the elt.

My present invention relates '.to the joint -plete disclosure as a product, my application Serial 367,542 ,filed April 11, 1907; from which this application has been divided, covering the method and apparatusto which reference is made hereinafter as a convenient mode of operation.

The various features of my invention will be illustrated fully in the accompanying Patented Sept. 3, 1912. 11, 1907, Serial No. 367,542.. Divided andzthts application filed .Tune 8,:'

drawing and specification and "pointed out in theelaim.

In the drawing,- Figure 1 shows in perspective an abrasive ,belt in which azjoint is-to be formed in accordance with my invention; Fig. 2 1s a fragmentary plan view of a completed joint; and Fig. 3 is a view inside-elevation of the joint shown in Fig; 2.

Inthe embodiment of my' invention selected for illustration and description to enable a 7 ready and complete understanding of my improvements, the reference numeral 1 designates an elongated sheet forming ,when its ends are joined a belt of a wellknown type, capable of use in connection with the sand-papering machine illustrated in my Letters Patent #833,7 26, above mentioned, the belt comprising a fabric foundation 2, with a surface 3 composed of grains of abrasive material such-as adamite or carborundum or other abrasive material secured to the foundation by a suitable adhesive. The ends4 of the strip of which the belt is composed are preferably cut on the bias at an angle of 45, so as to reduce to a minimum the transverse interruption of the grinding surface and to make the joint as strong as possible.

The-joint may be completed by any means and in any mannersuitable to accomplish the purpose of pie by the apparatus and method forming the subject 0 States Letters Patent, Serial No. 367,542, to which reference may be made for a comof said preferred method and a paratus, and in the completed joint, referring to adjacent 'to each other preferably with their margins in abutting relation, and the joint referably has a reinforcing strip 40 of. fabric referably similar to that of the foundatlon 2, and as thin as may be used my invention, as for exam-- Fig. 2, the sheet'parts 4 liev my application for United consistently with strength, secured beneath the ends 4' as by glue or other suitable hesive, under pressure and heat.

The heat and pressure ordinarily leave the surface in a non-abrasive condition adjacent the region of the joint, owing to submergence of the abrasive gralns by the adhesive, but in accordance with my invention I provide this surface with an artificial graining as illustrated in the region of the joint at 49 in Fig. 2, so that the individual abrasive particles protrude, as illustrated clearly in Fig. 3, to present a surface of high abrasive quality. Preferably the artificlal grain Will be blended with the natural grain and the finished joint will be uniform 1n abrasive effect with the rest of the abrasive surface of the belt.

As illustrated in Fig. 2, the completed article presents an appearance of absolute uniformity, the actual joint 49 formed b vention t us fully, and one suitable em the abutting ends 4, being scarcely discernible Without the closest inspection.

Havin illustrated and described my inodiment thereof I WlSll itunderstood that I do not limit myself to the specific materials forth in the claim read in connection with this specification. t

What I claim, and desire to secure by Letters Patent is As a. new article of manufacture, a jointed abrasive sheet, having a surface of abrasive particles, the adjoining parts being secured by an adhesive having at the region of said oint an artificial graining from which the individual abrasive particles protrude to present a surface of high abrasive quality substantially as described;

Signed at Newark in the county of Essex and State of New Jersey, this seventeenth day of May, 1907.

J EMILE BEIN.

.Witnesses:

S. R. Camus, CHARLES E. HILLYER. 

